Port Authority of Allegheny County

Reporting mark: PAT
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Berry Street Tunnel (Allegheny County, Pennsylvania)
Built 1851-1856; Converted to road use 1998
Tunnel on West Busway
Open to traffic

PAT - Fallowfield Trestle (Old) (Allegheny County, Pennsylvania)
Lost Deck plate girder bridge over Ravine and Dagmar Avenue on PAT Trolley
Replaced by a new bridge

PAT - Monongahela River Bridge (Allegheny County, Pennsylvania)
Built 1903; raised in 1912-16 grade separation; rebuilt 1982 for light rail
14 panel Baltimore through truss bridge over Monongahela River, many city streets and I-376 on Panhandle Railroad/ Pittsburgh T Transit
Open to traffic

PAT - Mount Washington Tunnel (Allegheny County, Pennsylvania)
Built 1902-4
Tunnel on Port Authority of Allegheny County Busway/Light Rail
Open to PAT traffic only.

PAT - P&S Extension Tunnel (Allegheny County, Pennsylvania)
Built 1865; now part of PAT light rail
Tunnel on Railroad

Smithfield Street Bridge (Allegheny County, Pennsylvania)
Built 1883 under the direction of engineer Gustav Lindenthal
Two-span lenticular through truss bridge over Monongahela River on Smithfield Street in Pittsburgh
Open to four lanes of traffic